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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44623bc12429b0c34dc85ab7e03f16ac4afdb5f3022d3683e04a8475eeacad06' 
  AND token = 'N4/bttalEm6xsnfi4qZd1QYnxpl2FhWfazSM/GH+iOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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