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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a9d0bbac9e767e692e481b668e8c26305dcd0ac42d535b7efd24c20aad4dae' 
  AND token = 'vgu9CRMKZv4Jk+lzaNmPntmtpvVaZd2q7D9t5eAH9ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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