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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be96cf397509eaeaf26b9640d7cb25bd4f8d408c205c5582b221b32af0846cc3' 
  AND token = 'uoznZ0zHl3y0hhDOKCmaWX23W6dV6G7xR1e7n+7YGsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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