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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bf0bce2e4dbd1e6b91c5f7fa0eec003dc379b4f0aa01caf727a2d20db724fc' 
  AND token = 'QWHaP6uqe9ZVDxfjGkwVuS/Cxa09qQaaK7R7W8rfIAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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