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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ca2aa3278ee6ef79675604febc223863ccf40fd8d7bfc70c4eed146a36aa08' 
  AND token = 'ChKyNEjUbX/3/Uvzph8mdvPIju2A6UFZgrGtj674x8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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