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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec707fe6b96f82f8718488c27e748be9e81631dfe75e85ccd0a58d03f893425' 
  AND token = '7EeGhRh2ZZ5lqaUrHuNv7ei2bmXQbEWIOJOSqG8hfYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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