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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6796547689db55d822056649a790458b2bee2d78c95dcf3e416f364d1713a1' 
  AND token = 'cK1oe+U2Mx5INP58ySpaLmJcBaddqReFPdJ9d8Ey0kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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