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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf902f42d3be46f792489352803c296fb29f9b57936cf046cfb2615214065f8' 
  AND token = '77UbR6LuX4Nnsv3bTQ6ygC4D5BNCZRAhL7GlmdG+u6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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