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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a7deec7bc4a60f154cd58ffe2d0e156901f55b3da959a8fccc7882796a54d3' 
  AND token = '2OLLsxzRplV8L8MD2xA97zh7O3XXUGAASMQOIbHtpZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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