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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465e7d43402aa386a05b5f8fa71258b7af75784ea5377723a2f3c2b0f35f71b7' 
  AND token = 'Bd0+wjntvsh0wGLGoZiesPmo6QDqZrMIENqNE1rbS8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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