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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dec703390093ddcfe4213a7e7a1a699c73fd46dc0f39f0dc48d9ecc04a3ea6a' 
  AND token = 'yTlF+vHeeUw6BWZxUILCzRoduRk4M5k0CdBEcxZt8gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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