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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a18a027b6084910f8f6057333b9eee0850adf6dae0ec2138f7e25e9f25afa26' 
  AND token = 'BQWw+W2Vlnha4Vxf/CS67wpALgz6d32OEJk764ka4GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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