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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3438f508465aafa81dab9ed79b993e39bb2121c3dd7a456a9e2ba9313c90ea' 
  AND token = '5FivhoMjEzXQcL5QxwpkR+v2arfXVjx7se/Fkici8Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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