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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58bee778bb424cea0c6c52e9bdb7a5652a5e87f0862e93a90d68f4e249eff19' 
  AND token = 'ocQHMCSZ2SUqR8+oGU2QNGMm9FyoRQX+ZE6loa2+2mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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