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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384b0fb63564d752c41522467cee641083c76574b31b5a0da6c61e8a2d6d0d8e' 
  AND token = '3AbIXDmtLrBiOl8j2hxlzD/Ddxm1+SIfHqh1sJzqkUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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