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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d13a7c87a038126b6a09229f55027e1c81ab9a94e1059f876b996d3aff5c9e5' 
  AND token = 'uBo9gRNI7EssnkLIJxARV9f8PbC1tJLD0Q8A9B1L8Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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