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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcf59764a9a82a435c0113d0053b38fa416fe5fe8f821b92cbdd8d780a7f002' 
  AND token = '/JJEWqpjwZy326642SweNx9NOTvFTO96VeKE8SbxQ/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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