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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb411b8bcefbfb64e7cb670a3c79a51eb48a19b604579741ead29aa92bf80a90' 
  AND token = 'aJ/KTbn20CiTp3PSC9aDsw2m104oi35kluJ1mieo/3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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