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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686d3a791223211ac897d9974f549b60253a30cbc86c4b515e24b6c594ca4cfe' 
  AND token = 'ZcBKVMTC2j1jMEM7FD4AeSExXW21W+lHju+B8jG9+rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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