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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8a13799a05eefca1a744797b3e24302f9edc1681a7419f24174ec24d5bc673' 
  AND token = 'rsGKe/HAT6d6IHsucHpQTXBN4xyQlz9LjyaOmepxj1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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