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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f0d2e69eb914c28dd30cf0403c12f2966d6d5af488633d2bc09b1a920d96b9' 
  AND token = 'VC2UY7STZCHS3Q0zeeuar3u3Tfzeo13aWRVDeYr+PnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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