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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab05cbe7b77285641c45017ff2b7844ff0e441511b6d906f785b661c72457850' 
  AND token = 'OBZCxs11Vrrxm/Q/r9yWw4Liy1pngl8OAQGmgNzvSmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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