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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc41cf8f9fd05a9f5a40a32abc9120be92d9d593c1930767772fe038dd1fedc' 
  AND token = 'GBSzfBQKMMFO8SaplT6wC/tPNXHTDNXK0P+PXdOb87E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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