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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42fb2d132d7e3045fc3d73acdcfc11801b31d7445e536ee1525d47f3d55fc930' 
  AND token = '9ZJflfGF1dYwKJFb9XalxXadPaU0Kp1+nD2K46tXeuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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