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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fb90fe139a7781e5827a18d77a9f00ac0fca054e1552b5adfa458ae06171dd' 
  AND token = '+dCzTp1rutGeumu0dwloIqC322EKMX9k7fuTxIpkwP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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