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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f283f6556883475ed17155f8da17fa38232db037cf3f8c65f94090c859b7a936' 
  AND token = 'n8/j0J5SrlJzUIxI6GRvXFa0M5nITWsoSM9a5X75+WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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