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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2b38aebd4ec67bd2d1b48f0545232cfae0c57046dea3a3ff111b50ac62b558' 
  AND token = '4SNmZaEP7IH+xV6g60hl6EO1xBSFjP97Z2PswpLHLlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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