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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87d2f6376783c0277ed029e0ac683809b890850dc3235ff1f757d4d5953da84' 
  AND token = 'gZNsKa/dzpsdWUk9Ou9NXgD34w/YgyF4kxeVVIDM64E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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