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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdc6c970bf01d3e1a3ae6baf4ae5214239a59ee3ac9dcd39d72c4139153fabd' 
  AND token = 'GoCFNb/gfo5wmK9pbSzpCbQ0kEmNG3LXzJT+vqv6QdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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