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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c0c7a0fb5af5ea76b9e36f219ca8e7858673a7520802b02cba5e58c628e2689' 
  AND token = 'eOI7GrXUs8Z4gPTc/0Ngx7/Tt0uFwEL+U8n3pYcx694=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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