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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbf06d45e2cdbf4063f7846a5169e7ae55db7460c91171d5d7100c4da6bc247' 
  AND token = 'MARTWnnB6EnvI7XI+30qdXfHwye6dsPR0pEPUMx3/gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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