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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bf5b2a2f7d42d90a0beda343928afc789da3997af75b9d6484b0c5ee17d80a' 
  AND token = 'kPHf7iNY3gR0+a1ZTT9LmLrbiFBoVEgKk8zeWS/6VlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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