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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac5a9acecdbf2f5ead6b4f9884396559286b1da59f25c7cf26253cfd898b6f2' 
  AND token = 'aUG2ckLqyjlaLpJy55d38raRYF0YGFCWqeEL++eqUMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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