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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee863ca4cfc785fb52e9cb0042bb472361814370c460701fd568268e8c5b894' 
  AND token = 'R0flmlif26aiiLvJ4a71R2fw2uY8qZ54p3kP0kUJwxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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