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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09b26fd877710742004cf06cb0ebf24a1c7afe691036a26ce3ceae1032e8862' 
  AND token = 'FXMEQ6OSO4rVpPoF4xzf+AHwrlY0BxBgfOFc2twDrac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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