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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bf83e72f76770af53d728bc4204bf2dbb8df7bbdd1fccf32e6c0530de1647e' 
  AND token = 'E9hQc6QhUYA1V4lgvZb9eYxvVDFrFrWYeKLcjdTCrh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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