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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168a5ab8c7c89d0f765b72e4e03bc6e409861821ef407e153d8d270ce214a266' 
  AND token = 'Nc9cTpurnC86At54qBVJvKj1gC4GSfFLMbEYxa4AwQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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