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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86a57737d98884a3fb262578cd5a83ef74965e0e3bc01e84ca187d7f19c5674' 
  AND token = 'Xbeyuji9cwsImvj4DhSoDJ9CzKlrHxHOsaWPG3Eb61Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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