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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7d47885e7b6a5ac6cabf62d7b813f5f7cd9016e12135c636369ae7c3c7f6a5' 
  AND token = '8nNRs+Hn9OKs3W2e0pYoE10Bs+ont8qT22AHGA5okdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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