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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccabd2e2e4ce0071bace72629295b079fad40e6b1f63b40c783bfcd5c3301e5d' 
  AND token = '1nbAGCAas9dt/eSA6BcHFwlSl0uUSlBIy0j8J8bU6Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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