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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9c0ab028602f3fc086e73772fbb3c5a69efdd6cfdb0e48c1fc844257503d8e' 
  AND token = 'WTKeGE+glzucAEm/qqI0ti+x21oUHGfbevrfMEvSYYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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