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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f36765bf733a17e62ae0ac183978ce3f5651d40619efc20cd0a4ff9fb7a819f' 
  AND token = 'V24pqQ2/H/i4VfSQFmZN3FcQOYhqqSuEsYngrr+ieGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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