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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7257c5442909e55091af43d16ceed8dfea087149e4b7ed0428f4d4299a62f98c' 
  AND token = 'ZMQhIkiskDgZ3EbVI0t899vaBqYfarzZd3rdKf8yJGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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