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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949d7de67ad63f01ba9acf2d78ffa623730504b334de678f3392bfb73cbffba9' 
  AND token = 'uIvvv3eGwFgg27TTi9ErpkXSPNTDOxLyMEw8E+sJfjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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