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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371d49be30f334d0f5fd6585da1cbb296585d5aa57007921ceea2423db3d52ad' 
  AND token = 'X7s6Rt5H5LB7YsVyPqDHc3dkT9rR7JrYVnKK16HlE+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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