SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9524d3c678fb74a3468e1f2f086625ddd78f13917ffcbe02bc3344aa76bcad7' 
  AND token = 'gcVxGLE/EcAiGsG2K02/ZIpz7C63tk2AldSIyWBcyw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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