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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536b646e98dcf6aa97dd7515d603d8ea16525dc3863de94fb204c8c0367e5135' 
  AND token = 'svh2XtSr7rdexDcXvy1TTwPcNDjuJBEjKHkesy3VncA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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