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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99db53818ec3ad701a11ca8ba0c6f04ac4719d368aa283499f5e11517b8e578' 
  AND token = 'S7kKQQ7DREL694RGewvI2XEpvt28D/HkNgmFgtm1o+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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