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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114006ce491827b5b1479a3bc61d1e4006fa37a2d978393b74bd74f744022496' 
  AND token = 'BICc/5xzXtlzDRPfhWH976eQCbfBGULsPVHkh+pcG9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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