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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1764b3e33c87261da8cd10d81e107d3190772ee52ff8fd8db7f4d3457e27dc05' 
  AND token = 'CfPlsMk45pFLyqynaqhD1tFV9e9JSqvDrTc6+8F734Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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