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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1414f0a5c39df0a4135df3c8897294d9de0d115edcfa1533fc8a9ae5ca2b1d' 
  AND token = 'KGc7vdOI5Ci7+TTVXnNg9I0PBb58bwaVmOC2xFt9XVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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