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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5d2e0100200bcd484e43f0cac02bb662280d3c9a4d9056cc2ecfdb65fd1bd8' 
  AND token = 'EMLVBOVVzSao0uZcPH9SIk2+pPv6k3bX/Hd8a1eDxsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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