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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075af330c49b7a12ed9d0fc186bba7390fb64c2f69310bd83ae952cce6079c30' 
  AND token = 'SxBMQNoVQKhHsWzv+CibwlBDe1AMDph6fd3yHnq2wo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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