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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82dfca5ae03b4a2a01739a9d18a3d24e6b0f641e27fc549ea00e727837d71acd' 
  AND token = '3Gqa2aUOsZqbxH/Wu0XsevOXsllDpczt4aLOpa8zLxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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