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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf178a7abd16791be30d04d716f68ffc7d238fc152db92aab859c341fb6d83e' 
  AND token = 'aZ0fGpgXoe5wz3qqw6rKIdTenPkzzsksB4yE88NNrSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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