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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953f01d9ffb08d89a66f3c0661db1dce942c39c8c131924900ee6b7802f41c9c' 
  AND token = 'pOta+YnTkpUm93URdHUg8zksE0Es8/Fk6U1L16IDXRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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