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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744355642e2d4f4c9526caae73238fc198fe0a98201296e9f5e12f68bceb92f5' 
  AND token = 'vzZczP/3sASmkW6a0wCXOgWzZxB0PPsDsnVBuDSxtoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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