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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a6a4482bfd8140eafbb36a90024fbfc33a155f8f5139e777a15efa18ca4108' 
  AND token = 'rBwYJAWNpboI1wRD0cj/BJ6/5AJp9L32l+2Pf7F7T0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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