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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a479ecfb8a7698e42c11f6b292c9b7218ab92796432dac31f51acd525de4c3' 
  AND token = 'liWn6sv6SG+HvIjMwUykqwg7tOaMIapdfOD17r83LLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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