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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc5c0791d7cb537c70b2a55b00927eb1072341b8389253e0c759bbe78fa8b71' 
  AND token = 'EnGqBxzjPDk6/G3tU1gyzKmLRV4Trt3t5Ko0nObojYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}