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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960042b13dc7ec64a30d2e5000604697f787c8dff37dc606dc08f6a70e7fd449' 
  AND token = 'XeKSJRef5YlFu+lOWx6c6DsZgw3psbzGKsXf7e5Xk/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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