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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3691d6a662249eca7e44fc72bc9e70aea59cc845649c760de57e04284f0daf98' 
  AND token = 'rRACVkQijVQU4ZoWSX20woUCya4MGkENdP1gXi+L3j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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