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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a39f04053a1e89cc6bf110b42edb407f4e4a4d0ce3c95414708d7e0d1ecd5475' 
  AND token = '4Zat97dO4SsLbh5FqYKmWwhgT8dPOqSqGd9kybnzbaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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