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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b148e6dc7c69ba088337f1bcad8bb4fcb67452c231c5a8b38b7d78fcd7204fce' 
  AND token = 'KvfTECFr4f0XJDPfkEv7vidfwzDRzvUdNl0+eWCkYuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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