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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4984c474b756032d1e2152476b681f2d36e334472a40f695b432a947c851ae' 
  AND token = 'NGydvDHahHwRGlEXKQIQu0O1NSK8Jv5S7EbwdA9hguA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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