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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d93c8b8a87f21f0d4361019003dd790675c8cc7b8c63371bbc21384538696f' 
  AND token = 'k0dNdijFXvScNxlZRl2zL/zIduPfeoEDwd/k/sjA4n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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